Infrared multiphoton decomposition and energy-dependent absorption cross section of chloroethane

Francisco , Joseph S., Lawrance, Warren D., Steinfeld, Jeffrey I. and Gilbert, Robert G. (1982) Infrared multiphoton decomposition and energy-dependent absorption cross section of chloroethane. Journal of Physical Chemistry, 86 5: 724-728. doi:10.1021/j100394a027


Author Francisco , Joseph S.
Lawrance, Warren D.
Steinfeld, Jeffrey I.
Gilbert, Robert G.
Title Infrared multiphoton decomposition and energy-dependent absorption cross section of chloroethane
Journal name Journal of Physical Chemistry   Check publisher's open access policy
ISSN 0022-3654
1541-5740
Publication date 1982-03
Sub-type Article (original research)
DOI 10.1021/j100394a027
Volume 86
Issue 5
Start page 724
End page 728
Total pages 5
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
The results are presented of an investigation of the multiple infrared photon decomposition of chloroethane with radiation of wavelength ∼ 10 μm, which is absorbed by the C-C stretching mode of the molecule. The study employed a focussed beam of maximum fluence 190 J/cm 2. The fluence dependence of the fractional decomposition with ṽ = 966 cm -1 radiation under nearly collision-free conditions (0.035 torr) was quantitatively interpreted by solution of the appropriate master equation (taking postpulse collisions into account) to obtain the energy-dependent absorption cross section, σ(E). It was found that decomposition at high fluence (arising from energies in the range 19000-28000 cm -1) and energy absorption at low fluence (mean absorbed energy ∼ 150-1000 cm -1) could be simultaneously fitted with σ(E)/cm 2 = 2.5 × 10 -19 exp[-3.45(E/hv) 0.14]. Comparison of this dependence with that found from data obtained with ṽ ∼ 2700 cm -1 suggests that the oscillator strength is strongly dependent on the mode being excited, even when the energy is thoroughly randomized within the molecule.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemistry and Molecular Biosciences
Centre for Nutrition and Food Sciences Publications
 
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Created: Mon, 07 Mar 2011, 15:42:08 EST